add site_dead flag to prevent delivery to dead sites. Allow sys channel webpages to be viewed even if site is configured "block public".

install/update.php

@@ -1,6 +1,6 @@
 <?php
 
-define( 'UPDATE_VERSION' , 1142 );
+define( 'UPDATE_VERSION' , 1143 );
 
 /**
  *
@@ -1645,4 +1645,15 @@ function update_r1141() {
 		return UPDATE_SUCCESS;
 	return UPDATE_FAILED;
 
+}
+
+function update_r1142() {
+
+	$r1 = q("alter table site add site_dead smallint not null default '0' ");
+	$r2 = q("create index site_dead on site ( site_dead ) ");
+	if($r1 && $r2)
+		return UPDATE_SUCCESS;
+	return UPDATE_FAILED;
+
+
 }